I have this same issue and it doesn't seem to be a problem with the car... I think it's just really fussy when it first starts up.
It's like when you hit the gas you get jerked back, but your foot releases pressure on the gas, which makes you surge forward...which jerks you back...etc.
It's Newton's law...equal and opposite reaction.
When this happens I just step on the clutch and switch to second gear.